Properties Definition and 1000 Threads

In comics, Captain America's shield can absorb an incredible amount of kinetic energy from impacts (if not all of it) because of its vibranium makeup. That is why he can block hits from super-strong beings like Hulk without any damage done to him or him going backwards. But when he throws the...

I'm going absolutely nuts over this chapter...ther seem to be millions of terms,which all seem to mean the same thing...could someone help me out?? Okay,the first set of questions I would like to get cleared is... 1. The proportional limit on a stress-strain curve is supposed to be the point...

Homework Statement I'm trying to look up the specific enthalpy (h) at 4.8Mpa and 40 degrees celcius for water vapor/steam. It should be a saturated liquid. The Attempt at a Solution I know the specific enthalpy should be ~171.78KJ/Kg but I can't for the life of me figure out how the...

Homework Statement Ethylene Glycol, C2H602, (d=1.12 g/mL) Antifreeze solution will protect engine for temperatures as low as -20F Homework Equations What is the minimum molality of antifreeze solution required? The Attempt at a Solution Need help starting.

Mechanical properties of matter problem, urgent! Homework Statement When a beaker partially filled with water is placed on an accurate scale, the scale reads 22g . If a piece of metal with density 3800 kg/m^3 and volume 2,4 cm^3 is suspended by a thin string so that the metal is submerged in...

Homework Statement suppose that 14, 10, 18, 21 constitute a random sample of size 4 drawn from a uniform pdf defined over the interval [0, theta], where theta is unknown. Find an unbiased estimator for theta and y'3, the third order statistic. What numerical value does the estimator have for...

Homework Statement Body A weighs 110 N, and body B weighs 37 N. The coefficients of friction between A and the incline are μs = 0.56 and μk = 0.25. Angle θ is 40°. Let the positive direction of an x-axis be up the incline. (a). Find the acceleration of A if A is initially at rest...

In discussions of questions related to gtr, it is often useful to know that one can in fact "create solutions to order" in gtr, when one wishes to model specific physical scenarios. Sort of, not really--- and herein lies a tale which illustrates some of the many thorny technical and conceptual...

Homework Statement List the ductility, yield strength and Young's Modulus of steel, rubber, nylon, concrete, alluminum, glass and rubber Homework Equations none The Attempt at a Solution I tried google and wikipedia with not much luck so I figured i would ask here. Any repository...

Im looking for thermodynamic properties of seawater, especially specific heat and enthalpy. I am designing a solar desalinator, and I am trying to determine the required amounts of energy to evaporate the water. Is there a way in which I can determine the enthalpy of seawater by knowing the...

Homework Statement A plane, harmonic, linearly polarized light wave has an electric field intensity given by {E}_z = {E}_0 cos pi*10^{15}*(t - x/.65c) while traveling in a piece of glass. Find (a) The frequency of the light. (b) Its wavelength. (c) The index of refraction of the...

If I have ∑(k xi + j yi)...how will I apply the distributive law on it?...I mean how do you split this notion?

Homework Statement Find the equations that satisfy the following properties: 1) f:(0,infinity) -> R is continuous and bounded, but f has no maximum and no minimum (that is global min and max). 2) k:[0,infinity) -> R is continuous, but k has no maximum and no minimum (again global min...

Can anybody think of equations that satisfy the following properties: 1) f:(0,infinity) -> R is continuous and bounded, but f has no maximum and no minimum (that is global min and max). 2) k:[0,infinity) -> R is continuous, but k has no maximum and no minimum (again global min and max).

Greetings, I need to know which gas/liquid can absorb high amount of heat when passed through a hollow copper tube, heat is generated on the tube. The gas/liquid should not be conducting at ant point. If possible the conductor should absorb more heat than is generated at the tube.i.e...

1. Homework Statement State whether true or false: If A and B are singular matrices, then AB is also singular. 3. The Attempt at a Solution I know that according to the Lemma, if A or B is a singular matrix, then its product AB is also singular. However, it doesn't speak to what...

Homework Statement If B=C^(-1) Is (B+C)^2=B^2+2BC+C^2 Homework Equations If A and B are (mXn) matrices and C is an (nXp) matrix, then (A+B)C=AC+BC If A is an mXn matrix and B and c are nXp matrices,then A(B+C)=AB+AC The Attempt at a Solution (B+C)(B+C)=B^2+2BC+C^2...

Hello! I am doing an investigation on thermodynamic propeties of certains heavy ions "Alkali-Cloride" ions on the basis of mass spectroscopy and quantum mechanical calculations. For that i use GAMESS as a computer tool to study quantum mechanical properties of those ions (vibration frequency...

1. Homework Statement Let A and B be (2x2) matrices such that A^2 = AB and A does not equal the zero matrix O. Find the flaw in the following proof that A = B: Since A^2 = AB, A^2 - AB = the zero matrix O Factoring yields A(A-B) = O Since A does not equal O, it follows that A - B = O...

1. Homework Statement Let A and B be (2x2) matrices such that A^2 = AB and A does not equal the zero matrix O. Find the flaw in the following proof that A = B: Since A^2 = AB, A^2 - AB = the zero matrix O Factoring yields A(A-B) = O Since A does not equal O, it follows that A - B = O...

I am starting Number Theory this semester. My professor hands out notes but there is no textbook for the class. So hopefully you guys can help me with these seemingly easy problems. Z = {...,-5,-4,-3,-2,-1,0,1,2,3,4,5,...} Z is used to denote the set of integers 1) Show that if a is an...

OK, I understand, mostly, about isotope differences. What I don't get is why Helium-3 is considered a fermion, and Helium-4 is considered a boson. Why is this, and what possible effects does this have? Some explanation on what defines bosons and fermions would also be useful.

In string theory, what are the fundamental properties of a string? Is the tension in the string a constant at all points on the string and the same in all strings? Is the string "labelled" with fields/spin/etc along its length? How about "velocity"? Is each 'bit' of the string labelled with...

Let's say you have a vision of a material with certain special types of properties. How would I know what the chemical structure and components of that material would be? Is there some way to at least estimate what the chemical structure would be, and its a matter of guess and check? Does it...

Hi all, I have quite basic questions about the general properties of operators in quantum field theory. When quantizing the free scalar field, for instance, you promote the classical fields to operators and impose suitable commutation relations (canonical quantization). In momentum space the...

Hi, I've been studying from Spivak's Calculus. Normally when I have trouble I can just search, but this time I can't find anything (you can tell how extensive this forum is in that I've been registered here for a while and this is my first post). On page 89, the book gives proof of the...

Hello! I would like to ask anyone who can have documents about the thermodynamic properties of CsCl, Cs2Cl+, CsCl2-,Cs3Cl2+,Cs2cl3- to send me the links please. or anything else that can be related to thermodynamic properties of heavy ions. Actually i want to make a research on their...

I simply do not understand what the young modulus is. Help on properties of solids such as ductility and malleability would help!

Homework Statement A fisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. It takes a time of 3.00 second for the boat to travel from its highest point to its lowest, a total distance of 0.690 meter . The fisherman sees that the...

Hi all, I was wondering if someone can explain to me whether: 1) Superconductors are attracted to originally unmagnetised ferromagnetic or paramagnetic materials? AIUI superconductors are perfect diamagnets due to the Meisnner Effect, and magnetic attraction is due to the creation of...

I am looking for results which provides the homology and homotopy groups from some property of the space. For instance, if a space X is contractible then H_0(X)=\mathbb{Z} and H_n(X)=0 if n\neq 0. Another example is the Eilenberg MacLane spaces K(\pi,n) where \pi_n(K(\pi,n))=\pi and...

From what I understand of GR, time dilates due to the gravity of massive bodies. I like to think of it as the three coordinates of space drag, or lag, through time at a slower rate resulting in distortion of space-time. Correct me if my logic is flawed. But my question is this; why do bodies...

...are fascinating. At least I think so. Sine and cosine are the additive inverses of their respective second derivatives, for example. Astonishing! Are there any other startling properties of trig functions (not inverse trigs) that would just blow my mind? Somewhere in the beautiful...

Hi friends, Can you help me to seeing the meaning of the following pat from Gottfried's book on qm?to illustrate the failure of classical physics before the invention of quantum physics,he says--- "classical physics cannot explain why the properties of a sample of an element are identical to...

Hello I have been wondering for some time about, why I have to use orthogonality properties in a special kind of PDE problem I have encountered a few times now. As an example see exercise 13-3 in this file: http://www.student.dtu.dk/~s072258/01246-2009-week13.pdf" I have described my...

Let A be the adjacency matrix of some graph G. I am aware that A^n counts paths of length n between vertices of G, and that for graphs without cycles and non-singular A, (I-A)^-1 counts the total number of paths between vertices of G (correct me if any of this is wrong).This is a very...

Hi there, First post here, kinda feel as though my hand should be raised as I have a question. The questions are ... How much force could a bimetallic strip exert when heated? Would it matter how thick the strip was? Thanks for answering.

I have been trying to picture the whole process of a photon emission by a atom. So to have good understanding what is going on, I have came up with following experimental setup. A single hydrogen atom in excited state ^2\!P_{1/2}, which has been orientated with a magnetic field so that...

1. The question is: P on the set, A, of all people, where xPy means x is a parent of y. Homework Equations - None 3. Attempts at a Solution Here is where I am confused. Reflexivity is defined by aRa. So I am unclear what to do with more than one variable. So in this question, do I...

I am in the middle of a large project as an undergrad mech. engineering student and my team and I are having some modeling issues. Here is a description of our task: We must modify the design of a digital spool valve for a company. We have a spool, and 2 electro-magnetic endcaps that the...

The type and potential energy of interatomic bonds in solids have a direct effect on which of the following properties? (That is, which can be determined based on bonding information alone?) a. Melting temperature-yes b. Yield strength-no c. Elastic modulus-yes d. Fracture toughness-no e...

What effects do the physical properties (size of atom etc.) of an elemental metal have on the threshold frequency for that metal? I haven't been able to find a correlation between a physical property and the size of the threshold frequency myself; maybe I haven't looked hard enough, or maybe...

list of index notation properties ?? Is there a list of index notation properties somewhere on the web ?? I'm just looking for a pdf file that I can reference while manipulating tensors using index notation (and summation convention). I'm not looking for proofs at all, just a quick...

Homework Statement Use the properties of logarithma to xpand the logarithmic function ln[(x2+1)(x-1)] Homework Equations The Attempt at a Solution [ln x2+ln 1]+[ln x-ln 1] 2 ln x+ln x

Homework Statement Let A, B be both matrices with the same dimensions. Is AB^2 = (A^2)(B^2) a valid claim? Homework Equations The Attempt at a Solution I attempted to show that (AB)^2 = (AB)(AB) = A(BA)B and that (A^2)(B^2) = (AA)(BB) = A(AB)B, so for A(BA)B to be equal to A(AB)B, AB must...

Hello, I am writing a small report and trying to be mathematically accurate in my terminology- I am trying to describe an arbitrary volume of gas, but this volume must (1) not have any holes (or bubbles where the gas cannot go) in it, and (2) must be one single volume, so a gas molecule from...

Tell me what your ideas are for this multiple choice question Compared to semiconductors, metals, and ceramics, polymers: a) have lower melting points b) tend to have lower densities c) deform plastically to a higher extent d) have lower electrical conductivity e) all of the above f)...

Hello. I have several theoretical questions about Marx generator circuit operation. Note that I am in no way attempting to build one of these, as I would surely never compromise the integrity of this board by intending to build such a risky device. I am curious about the recommended value of...

I know this isn't in the usual template, but i have a big problem! I opted to do a piece of physics coursework on Gore-Tex, which I have since found to be expanded polytetrafluoroethelene (ePTFE). The bulk of my presentation needs to be on gore-tex's properties, but i have found it impossible to...

Hi. Firstly, can a particle every be found within the potential barrier? I've used the search function to look for an answer for this question, but I didn't really get anything conclusive. However, from what I gather, since there is a probability associated with it being 'found'(meaning it...